TouK/nussknacker
Oct 2024 – Feb 2026
14 Months active
Languages Used
JavaScalaTypeScriptYAMLMarkdownHOCONShell
Technical Skills
Compiler DevelopmentExpression Language ParsingType System ValidationUnit TestingBackend DevelopmentCI/CD
Mateusz Słabek
PROFILE
Mateusz Słabek
Over 14 months, Michał Sławiński contributed to TouK/nussknacker by delivering features and fixes that improved deployment, reliability, and developer experience. He implemented robust validation in the scenario compiler, streamlined Flink table configuration using inline SQL DDL, and upgraded the project to Apache Flink 1.20.1. Michał enhanced CI/CD pipelines, introduced an Uber Jar assembler for AWS deployments, and clarified authentication and Kafka documentation. His work spanned backend and frontend development, leveraging Scala, Java, and TypeScript. By focusing on configuration management, build tooling, and security, Michał consistently reduced maintenance overhead and enabled more flexible, stable, and secure deployments across environments.
Overall Statistics
Feature vs Bugs
76%Features
Repository Contributions
31Total
Bugs
6
Commits
31
Features
19
Lines of code
5,835
Activity Months14
Your Network
39 peopleSame Organization
@touk.pl12
Dawid PoliszakMember
Filip MichalskiMember
gskrobiszMember
JulianWielgaMember
Łukasz BigorajskiMember
Łukasz JędrzejewskiMember
pielasMember
Marcin StelmaszczykMember
Pawel CzajkaMember
Shared Repositories
27
Work History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for TouK/nussknacker focusing on business value, technical achievements, and readiness for AWS deployments. Key features delivered: - Uber Jar Assembler for AWS Deployment Manager: introduced a mechanism to produce a single executable jar by merging multiple jars with configurable merge strategies to handle conflicts and duplicates, simplifying artifact management for AWS deployments and reducing runtime packaging overhead. Major bugs fixed: - CI Badge Link Correction: updated Maven Central badge URL and corrected the Build status badge link to reflect the current CI workflow, improving build health visibility and reducing confusion for developers and stakeholders. Overall impact and accomplishments: - Streamlined deployment artifacts and improved artifact hygiene, enabling faster and more reliable AWS deployments. - Improved CI/CD observability and developer confidence through accurate status indicators. - Demonstrated end-to-end packaging improvements and attention to release hygiene. Technologies/skills demonstrated: - Java/Maven packaging, Uber jar assembly techniques, and dependency merge strategies. - CI/CD hygiene, repo maintenance, and deployment readiness for AWS deployments. - Clear traceability of work through commit references. Commit references: - Uber Jar Assembler: 2d6ec37e28a5939e64922717dd8aaabc64d680c2 - CI Badge Correction: 6460ba8c4a23b1ee0e7a093a88e3304e8b574869
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for TouK/nussknacker focusing on business value, technical achievements, and readiness for AWS deployments. Key features delivered: - Uber Jar Assembler for AWS Deployment Manager: introduced a mechanism to produce a single executable jar by merging multiple jars with configurable merge strategies to handle conflicts and duplicates, simplifying artifact management for AWS deployments and reducing runtime packaging overhead. Major bugs fixed: - CI Badge Link Correction: updated Maven Central badge URL and corrected the Build status badge link to reflect the current CI workflow, improving build health visibility and reducing confusion for developers and stakeholders. Overall impact and accomplishments: - Streamlined deployment artifacts and improved artifact hygiene, enabling faster and more reliable AWS deployments. - Improved CI/CD observability and developer confidence through accurate status indicators. - Demonstrated end-to-end packaging improvements and attention to release hygiene. Technologies/skills demonstrated: - Java/Maven packaging, Uber jar assembly techniques, and dependency merge strategies. - CI/CD hygiene, repo maintenance, and deployment readiness for AWS deployments. - Clear traceability of work through commit references. Commit references: - Uber Jar Assembler: 2d6ec37e28a5939e64922717dd8aaabc64d680c2 - CI Badge Correction: 6460ba8c4a23b1ee0e7a093a88e3304e8b574869
February 2026
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 performance summary for TouK/nussknacker: Delivered two notable features and advanced test capabilities. Key features: Custom Configuration Creator for Flink Test Scenario Runner, enabling flexible test configurations; Boolean Parameter Editors UI Enhancement by integrating SpelParameterEditor with BoolParameterEditor for more expressive decision tables and transformers. Commits of note: bb106a6018c72e715591e34729cdb2d30190025c and e552d7f827f060fe6dac509db1ecd70c89eddfa4. Bugs: No major fixes documented this month. Impact: reduces test setup time, expands test coverage, and improves decision-table/transformer expressiveness, contributing to faster feedback loops and higher confidence in test results. Skills demonstrated: Flink test tooling, SpEL integration, UI/UX enhancements for parameter editors, configuration-driven testing, code collaboration.
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 performance summary for TouK/nussknacker: Delivered two notable features and advanced test capabilities. Key features: Custom Configuration Creator for Flink Test Scenario Runner, enabling flexible test configurations; Boolean Parameter Editors UI Enhancement by integrating SpelParameterEditor with BoolParameterEditor for more expressive decision tables and transformers. Commits of note: bb106a6018c72e715591e34729cdb2d30190025c and e552d7f827f060fe6dac509db1ecd70c89eddfa4. Bugs: No major fixes documented this month. Impact: reduces test setup time, expands test coverage, and improves decision-table/transformer expressiveness, contributing to faster feedback loops and higher confidence in test results. Skills demonstrated: Flink test tooling, SpEL integration, UI/UX enhancements for parameter editors, configuration-driven testing, code collaboration.
December 2025
5 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for TouK/nussknacker: Delivered security and user-experience enhancements, core OpenAPI reliability improvements, and environment updates that enable secure, scalable deployments for customers.
5 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for TouK/nussknacker: Delivered security and user-experience enhancements, core OpenAPI reliability improvements, and environment updates that enable secure, scalable deployments for customers.
December 2025
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 (TouK/nussknacker): Delivered a new MultiSelect Editor for Labeled JSON Values, enabling users to select multiple labeled JSON values with validation and integration into the existing editor framework. This enhancement expands data-modeling capabilities, improves input accuracy, and supports more complex JSON-based configurations. The feature was implemented under NU-2393 and tracked in commit 20118f4bb10c1b0ad31135efef2a58b9cc64c04c ("[NU-2393] Add MultiSelect Editor (#8714)\n\nadd MultiSelect editor"). Overall impact includes improved user productivity and higher data quality with minimal UI disruption. No major bugs were reported this month.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 (TouK/nussknacker): Delivered a new MultiSelect Editor for Labeled JSON Values, enabling users to select multiple labeled JSON values with validation and integration into the existing editor framework. This enhancement expands data-modeling capabilities, improves input accuracy, and supports more complex JSON-based configurations. The feature was implemented under NU-2393 and tracked in commit 20118f4bb10c1b0ad31135efef2a58b9cc64c04c ("[NU-2393] Add MultiSelect Editor (#8714)\n\nadd MultiSelect editor"). Overall impact includes improved user productivity and higher data quality with minimal UI disruption. No major bugs were reported this month.
September 2025
1 Commits
Sep 1, 2025September 2025: Delivered a critical bug fix to the Event Generator in TouK/nussknacker, improving testability and scenario validation by ensuring the initial context exposes helper utilities within the event generator's output context. This change strengthens test reliability and consistency for downstream validations.
1 Commits
Sep 1, 2025September 2025: Delivered a critical bug fix to the Event Generator in TouK/nussknacker, improving testability and scenario validation by ensuring the initial context exposes helper utilities within the event generator's output context. This change strengthens test reliability and consistency for downstream validations.
September 2025
July 2025
2 Commits • 1 Features
Jul 1, 2025Month: 2025-07 | TouK/nussknacker focused on documentation quality and test tooling readiness. Two targeted changes improved developer experience and runtime reliability without introducing functional code changes.
July 2025
2 Commits • 1 Features
Jul 1, 2025Month: 2025-07 | TouK/nussknacker focused on documentation quality and test tooling readiness. Two targeted changes improved developer experience and runtime reliability without introducing functional code changes.
June 2025
1 Commits • 1 Features
Jun 1, 2025In June 2025, delivered a project-wide upgrade to Apache Flink 1.20.1 across TouK/nussknacker, aligning build configurations, Dockerfiles, and runtime components. The upgrade covered multiple components, including connectors and the table API, to ensure consistency and compatibility with Flink 1.20. This work was implemented via a single coordinated commit ([NU-1872] Bump Flink to 1.20) and tracked through PR #7137. The change sets the foundation for enhanced stability, performance, and maintainability, and simplifies future upgrades in the pipeline.
1 Commits • 1 Features
Jun 1, 2025In June 2025, delivered a project-wide upgrade to Apache Flink 1.20.1 across TouK/nussknacker, aligning build configurations, Dockerfiles, and runtime components. The upgrade covered multiple components, including connectors and the table API, to ensure consistency and compatibility with Flink 1.20. This work was implemented via a single coordinated commit ([NU-1872] Bump Flink to 1.20) and tracked through PR #7137. The change sets the foundation for enhanced stability, performance, and maintainability, and simplifies future upgrades in the pipeline.
June 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025Delivered Nussknacker Designer Toolbar Layout Enhancements in TouK/nussknacker, introducing center-top and center-bottom toolbar positions and updating UI configuration structures, enums, and component props to enable flexible layouts. This work improves UX for designers, enables more customizable workspaces, and provides a scalable foundation for future toolbar extensions. The change is tracked in commit d34f0f822eec27a696a69c8582aa0d428713be02 ([NU-2128] Add toolbar configs).
April 2025
1 Commits • 1 Features
Apr 1, 2025Delivered Nussknacker Designer Toolbar Layout Enhancements in TouK/nussknacker, introducing center-top and center-bottom toolbar positions and updating UI configuration structures, enums, and component props to enable flexible layouts. This work improves UX for designers, enables more customizable workspaces, and provides a scalable foundation for future toolbar extensions. The change is tracked in commit d34f0f822eec27a696a69c8582aa0d428713be02 ([NU-2128] Add toolbar configs).
March 2025
1 Commits • 1 Features
Mar 1, 20252025-03 Monthly Summary for TouK/nussknacker: Delivered inline SQL DDL-based Flink table configuration and refactor, simplifying table definitions and improving component organization. Updated dependencies and provider registrations to align with the new inline approach. No explicit major bugs fixed this month; the refactor reduces maintenance burden and future bug surface. Overall impact: streamlined configuration workflow, improved maintainability, and better onboarding for contributors. Technologies/skills demonstrated: Flink, SQL DDL, dependency management, component registration patterns, and refactoring for configuration management.
1 Commits • 1 Features
Mar 1, 20252025-03 Monthly Summary for TouK/nussknacker: Delivered inline SQL DDL-based Flink table configuration and refactor, simplifying table definitions and improving component organization. Updated dependencies and provider registrations to align with the new inline approach. No explicit major bugs fixed this month; the refactor reduces maintenance burden and future bug surface. Overall impact: streamlined configuration workflow, improved maintainability, and better onboarding for contributors. Technologies/skills demonstrated: Flink, SQL DDL, dependency management, component registration patterns, and refactoring for configuration management.
March 2025
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 (TouK/nussknacker) monthly summary focused on improving authentication documentation and developer guidance. Primary deliverable: Authentication Roles Claims Documentation Clarification, aligning roles listed in the ID token with roles defined in the usersFile to ensure proper user role supplementation. No major bugs fixed this month; the effort centered on clarifying auth behavior and updating configurations to reduce misconfiguration risk. The change is tracked by commit 687c3424593df348f8b76269e41b68f69a258f45 (Fix description in docs for config: authentication.rolesClaims, #7526).
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 (TouK/nussknacker) monthly summary focused on improving authentication documentation and developer guidance. Primary deliverable: Authentication Roles Claims Documentation Clarification, aligning roles listed in the ID token with roles defined in the usersFile to ensure proper user role supplementation. No major bugs fixed this month; the effort centered on clarifying auth behavior and updating configurations to reduce misconfiguration risk. The change is tracked by commit 687c3424593df348f8b76269e41b68f69a258f45 (Fix description in docs for config: authentication.rolesClaims, #7526).
January 2025
5 Commits • 3 Features
Jan 1, 2025January 2025 focused on stabilizing the development environment, improving developer tooling, and strengthening core processing reliability for TouK/nussknacker. The work delivered faster onboarding, more stable dev cycles, and more reliable processing with clear refactors and UX cleanup. Business value is evident in reduced setup friction, higher throughput during testing, and clearer module boundaries for maintainability.
5 Commits • 3 Features
Jan 1, 2025January 2025 focused on stabilizing the development environment, improving developer tooling, and strengthening core processing reliability for TouK/nussknacker. The work delivered faster onboarding, more stable dev cycles, and more reliable processing with clear refactors and UX cleanup. Business value is evident in reduced setup friction, higher throughput during testing, and clearer module boundaries for maintainability.
January 2025
December 2024
2 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for TouK/nussknacker focusing on feature delivery, deployment flexibility, and codebase clarity. Delivered two explicit features with clear business value and prepared the project for environments with external namespace management. No major bug fixes were reported this month.
December 2024
2 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for TouK/nussknacker focusing on feature delivery, deployment flexibility, and codebase clarity. Delivered two explicit features with clear business value and prepared the project for environments with external namespace management. No major bug fixes were reported this month.
November 2024
6 Commits • 2 Features
Nov 1, 2024November 2024 – TouK/nussknacker: Key features delivered, major bugs fixed, and measurable business impact. Highlights: - CI/CD pipeline stability: Upgraded all GitHub Actions artifact plugins to v4 across workflows to improve build reliability (commits 5066b16bd04bf7730d40b06d1f569e5dc8f6cddc; d431297c8e4a6c5bf724e82a9f8b06f5f2855452). - Template evaluation enhancements and SpEL handling: Introduced TemplateEvaluationResult to distinguish literal parts from sub-expressions and improved SpEL parsing/default handling for templates (commits 14a9a7511b83b9755d205c4e36f2652e417cf98a; fca1a27467bbf624a7f0a877e6e72d054d521752). - Parser stabilization: Reverted fragment input definitions parser to stabilize type option retrieval in UI/backend (commit 383b4d578e586de18c96853093e7325e1fc7e9a9). - Test stability improvements: Reduced Kafka and periodic activity test flakiness with eventual assertions and timeout-based topic readiness (commit aa609c040a7994fdff15b9877f80e4bd4f6a279a). Overall impact: more reliable builds and deployments, fewer runtime/template errors, and more stable test results, enabling faster release cycles and safer feature delivery. Technologies/skills demonstrated: GitHub Actions automation, SpEL/template evaluation instrumentation, template parameter handling, UI/backend option management, robust test design, and Kafka testing strategies.
6 Commits • 2 Features
Nov 1, 2024November 2024 – TouK/nussknacker: Key features delivered, major bugs fixed, and measurable business impact. Highlights: - CI/CD pipeline stability: Upgraded all GitHub Actions artifact plugins to v4 across workflows to improve build reliability (commits 5066b16bd04bf7730d40b06d1f569e5dc8f6cddc; d431297c8e4a6c5bf724e82a9f8b06f5f2855452). - Template evaluation enhancements and SpEL handling: Introduced TemplateEvaluationResult to distinguish literal parts from sub-expressions and improved SpEL parsing/default handling for templates (commits 14a9a7511b83b9755d205c4e36f2652e417cf98a; fca1a27467bbf624a7f0a877e6e72d054d521752). - Parser stabilization: Reverted fragment input definitions parser to stabilize type option retrieval in UI/backend (commit 383b4d578e586de18c96853093e7325e1fc7e9a9). - Test stability improvements: Reduced Kafka and periodic activity test flakiness with eventual assertions and timeout-based topic readiness (commit aa609c040a7994fdff15b9877f80e4bd4f6a279a). Overall impact: more reliable builds and deployments, fewer runtime/template errors, and more stable test results, enabling faster release cycles and safer feature delivery. Technologies/skills demonstrated: GitHub Actions automation, SpEL/template evaluation instrumentation, template parameter handling, UI/backend option management, robust test design, and Kafka testing strategies.
November 2024
October 2024
1 Commits
Oct 1, 2024In October 2024, TouK/nussknacker delivered a key reliability improvement to the scenario compiler by introducing robust validation for indexer expressions. The update ensures proper handling of Unknown types and non-map/non-list TypedClass instances, preventing faulty evaluations in production scenarios. The change includes targeted tests for edge cases to boost the expression language parser robustness and regression protection. This work reduces runtime errors, improves developer productivity, and strengthens overall platform reliability.
October 2024
1 Commits
Oct 1, 2024In October 2024, TouK/nussknacker delivered a key reliability improvement to the scenario compiler by introducing robust validation for indexer expressions. The update ensures proper handling of Unknown types and non-map/non-list TypedClass instances, preventing faulty evaluations in production scenarios. The change includes targeted tests for edge cases to boost the expression language parser robustness and regression protection. This work reduces runtime errors, improves developer productivity, and strengthens overall platform reliability.
Activity
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Quality Metrics
Correctness94.2%
Maintainability90.0%
Architecture91.2%
Performance84.8%
AI Usage22.6%
Skills & Technologies
Programming Languages
HOCONJavaMarkdownScalaShellTypeScriptYAML
Technical Skills
API DevelopmentAPI developmentAWSApache FlinkBackend DevelopmentBuild ConfigurationBuild ToolingBuild Tools (SBT)CI/CDClassloadingCode RenamingCompiler DevelopmentComponent DevelopmentConfiguration ManagementContainerization
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline